SCREENSHOTS
There are tons of options available for displaying your pictures!
MAIN CONFIGURATION DIALOGS
PICTURE SELECTION DIALOG
You use this dialog to select the pictures that you want to display. You can also use it to determine which games are clones or are clones of another game, which games MAME identifies as working, which games are new, or which games have changed between MAME releases. In addition, you can preview your pictures, test your ROMs, or run a selected game.
There is also a Run Selection dialog that looks very similar that is used to choose which games you want to run.
SUPPLEMENTAL CONFIGURATION DIALOGS

The dialog on the left is used to choose your game picture directories.
The dialog on the right specifies how randomly placed pictures are displayed.
MAME-ONLY CONFIGURATION DIALOG
If you are not interested in having the screensaver display pictures but simply run games then you can configure it in a "MAME-only" mode. In this mode, only options specific to running MAME games are shown.
RUNNING SCREEN SNAPSHOTS...

This screenshot shows random picture placement with no overlap. Pictures that have the same name are grouped together. Here the game screenshot, cabinet, flyer and marquee for the game Mr. Do's Castle are being displayed. The background is the flyer for this game. Game name, manufacturer and year is being displayed at the bottom of the screen. Two icons for this game are bouncing around the screen.

This screenshot shows two pictures being displayed side-by-side with "Arcade Classics" title caption (editable). Game's marquee displayed above each picture. Game name, manufacturer and year being displayed beneath each picture, black background.

This screenshot shows four pictures being displayed, one in each corner with "Arcade Classics" title caption. Game name, manufacturer and year being displayed beneath each picture, black background.

This screenshot shows random picture placement with no overlap. Game name, manufacturer and year being displayed beneath each picture. Background is flyer of last displayed picture (Frogger in this example).

This screenshot shows the screensaver running the game Donkey Kong